Single-step chromatographic isolation of lithium from whole-rock carbonate and clay for isotopic analysis with multi-collector ICP-mass spectrometry

Hoecke, Karen Van; Belza, Joke; Croymans, T.; Misra, Sambuddha; Claeys, Philippe; Vanhaecke, Frank

doi:10.1039/c5ja00165j

Cited by 25 publications

(48 citation statements)

References 16 publications

(24 reference statements)

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“…The single systems used the protocols of Van Hoecke et al . () and Phan et al . (); see details in Table .…”

Section: Methodsmentioning

confidence: 88%

“…Use of the lithium isotope system as a reliable weathering tracer requires analytical protocols for a broad range of geological samples with varying lithium content and matrix/lithium ratios (Van Hoecke et al . ). MC‐ICP‐MS (Tomascak et al .…”

mentioning

confidence: 97%

“…) or without (Misra and Froelich , Gao and Casey , Van Hoecke et al . ) an organic solvent (i.e., methanol) are usually adopted as the eluent.…”

mentioning

confidence: 99%

“…In some cases, the single‐column method may not be sufficient, and therefore individually calibrated separation protocols are required to achieve complete removal of matrix elements and full recovery of Li during chromatography (Van Hoecke et al . , Phan et al . , Tomascak et al .…”

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confidence: 99%

“…For example, Van Hoecke et al . () developed separate single‐column systems for carbonates and clays.…”

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confidence: 99%

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Optimisation of Lithium Chromatography for Isotopic Analysis in Geological Reference Materials by MC‐ICP‐MS

Liu

Godfrey

2019

Geostandard Geoanalytic Res

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The lithium isotope system can be an important tracer for various geological processes, especially tracing continental weathering. The key to this application is the accurate and precise determination of lithium isotopic composition. However, some of the previously established column separation methods are not well behaved when applied to chemically diverse materials, due to the significant variations in matrix/lithium ratios in some materials. Here, we report a new dual‐column system for lithium purification to achieve accurate and precise analysis of lithium isotopic compositions using a multi‐collector inductively coupled plasma‐mass spectrometer (MC‐ICP‐MS). Compared with single‐column systems, our dual‐column system yielded a consistent elution range of the lithium‐bearing fraction (7–16 ml) for samples with a large range of lithium loads and matrix compositions, so that column re‐calibration is not required. In addition, this method achieved complete lithium recovery and low matrix interference (e.g., Na/Li ≤ 1) with a short elution time (~ 6 h, excluding evaporation), with the entire procedure completed in 1.5 days. We report high precision Li isotopic compositions in twelve chemically diverse materials including seawater, silicates, carbonates, manganese nodules and clays. New recommended Li isotopic values and associated uncertainties are presented as reference values for quality control and inter‐laboratory calibration for future research and were consistent with previously published data. However, significant lithium isotopic variances (~ 1‰) in BHVO‐2 from different batches suggest Li isotopic heterogeneity in this reference material and that Li isotopic studies using this reference material should be treated with caution.

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“…The single systems used the protocols of Van Hoecke et al . () and Phan et al . (); see details in Table .…”

Section: Methodsmentioning

confidence: 88%

mentioning

confidence: 97%

“…) or without (Misra and Froelich , Gao and Casey , Van Hoecke et al . ) an organic solvent (i.e., methanol) are usually adopted as the eluent.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…For example, Van Hoecke et al . () developed separate single‐column systems for carbonates and clays.…”

mentioning

confidence: 99%

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Optimisation of Lithium Chromatography for Isotopic Analysis in Geological Reference Materials by MC‐ICP‐MS

Liu

Godfrey

2019

Geostandard Geoanalytic Res

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Quantifying the impact of recovery during chromatographic purification on the accuracy of lithium isotopic determination by multi‐collector inductively coupled plasma mass spectrometry

Gou

Liu

Deng

et al. 2020

Rapid Comm Mass Spectrometry

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Rationale: Lithium (Li) isotopes have increasingly been applied as tracers in Earth and planetary sciences and their effectiveness relies upon accurate and precise Li isotopic data. Nowadays, multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) combined with chromatographic purification is the most common strategy for obtaining Li isotopic ratios in natural samples, with a longterm internal precision better than 0.3‰ in most laboratories. However, there is a large discrepancy in the Li isotopic compositions of the same reference materials determined by MC-ICP-MS among international laboratories (e.g. ca 3.5‰ difference for measurements of homogeneous seawater), which has been attributed to insufficient recovery of Li during chromatographic purification. Despite this recognition, the exact impact of Li recovery during purification on Li isotopic determinations by MC-ICP-MS has never been quantified. Methods:We employed a normal distribution function to model Li elution curves and quantified the Li isotopic fractionation resulting from Li recovery during chromatographic purification. Furthermore, we compared the calculated and measured relative recovery (R) with the Li isotopic ratios determined by ICP-MS to validate our theoretical calculation. Results:The theoretical calculations showed that R should be higher than 99.8% in order to avoid observable Li isotopic fractionation during chromatographic purification at IEECAS. This idea is further supported by the better long-term external precisions for data with R ≥ 99.8% compared with previous values of 99.5% ≤ R < 99.8%. Our results indicated that the large differences in the reported Li isotopic ratios for homogeneous seawater among international laboratories are probably attributable to Li isotopic fractionation occurring during ion exchange chromatography. Conclusions:Our theoretical calculation via R is the first quantitative and convenient approach for monitoring Li isotopic fractionation during sample purification, ensuring that R ≥ 99.8% can avoid observable Li isotopic fractionation during purification, which will improve the accuracy of Li isotopic measurements by MC-ICP-MS and the comparability among laboratories.

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Zirconium isotopes track volcanic inputs during the Permian-Triassic transition in South China

et al. 2022

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Single-step chromatographic isolation of lithium from whole-rock carbonate and clay for isotopic analysis with multi-collector ICP-mass spectrometry

Cited by 25 publications

References 16 publications

Optimisation of Lithium Chromatography for Isotopic Analysis in Geological Reference Materials by MC‐ICP‐MS

Optimisation of Lithium Chromatography for Isotopic Analysis in Geological Reference Materials by MC‐ICP‐MS

Quantifying the impact of recovery during chromatographic purification on the accuracy of lithium isotopic determination by multi‐collector inductively coupled plasma mass spectrometry

Zirconium isotopes track volcanic inputs during the Permian-Triassic transition in South China

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